Solid injection engine



p 1941- E. GRIESHABER SOLID INJECTION ENGINE Filed Jan. 2. 1939 3 Sheets-Sheet 1 'zzaaszi' E. GRIESHABER SOLID INJECTION ENGINE Filed. Jan. 12, 1939 3 Sheets-Shae? 2 u 7/ n u I "I," /llllll/Illllldrlll Ap 1, 1941.. E. GRIESHABE R SOLID INJECTION ENGINE Filed Jan.

v T Z 4 m Patented Apr. 1, 1941 UNITED STATES PATENT OFFICE;-

soup INJECTION ENGINE Emil Grleshaber, Milwaukee, Wis, assignor to Nordberg Manufacturing Company, M waukee, Wis., a corporation of Wisconsin Application January 12, 1939, Serial No.250,484

- 1 Claims.

This invention relates to solid injection and more particularly to fuel feed systems for such engines.

In solid injection engines employing a plurality of cylinders, and a separate fuel pump for each cylinder, it has been common practice to supply fuel under pressure to the fuel pumps from a single supply pipe. Such a system is not fully satisfactory as the inertia of the oil delays the flow of oil into the pump cylinder, with the result that the pump cylinder does not completely fill during the suction stroke of the fuel pump, which causes either a loss of power or erratic performance of the engine.

One object of this invention is to provide a fuel feed system for asolid injection engine which will-give a constant and full injection for each of the'cylinders.

Another objectis to provide a fuel injection system for a solid injection vehicle engine which will give a constant and full injection for each of the cylinders.

A further object is to provide a fuel injection system for asolid injection engine which will insure the. fuel pump cylinder being .completely filled on each stroke of the fuel pump.v

Another object'is to provide a fuel injection system for solid injection vehicle engines which will provide a constant quantity of fuel to the engine at each cycle regardless of the sway of the vehicle. r

Another object is to provide a fuel injection system for solid injection vehicle engines which will overcome the natural inertia of relatively long oil supply lines.

Other objects will be apparent from the following description.

According to this invention, a separate fuel oil pump is provided for each cylinder of the engine, with a single supply pipe feeding fuel oil into separate air domes adjacent each fuel pump. n the suction stroke of the pump, the pressure of the air in the air dome acts upon the oil between the air dome and the oil pump to inject a charge of fuel into the pump cylinder.

. In the drawings:

Fig. 1 is a side elevatlonal view of a' four cylinder solid injection engine, showing the fuel pumps attached thereto;

Fig. 2 is a cross-section taken on the line 22 of Fig. 1 looking in the direction of the arrows;

Fig. 3 is an enlarged front view of the oil-pump as seen in Fig. 1;

Fig. 4 is a cross-section on the line 4-4 of Fig. 3, looking in the directionof the arrows:

'Fig. 5 is an enlarged view of the air dome shown in Figs. 2, 3 and 4; and

Fig. 6 is a cross-section on the line 6-6 of Fig. 5, lookln'g'in the direction of the arrows.

Referring to the drawings, in which like numerals indicate like parts throughout the several views, ,the engine shown hasfour cylinders, although it is to be understood that the present invention will function equally well on any'solid injection engine. I a

The engine. shown in Fig.1 is mounted on a foundation I01: in which is built a muflier II for the intake of a scavenging air pump l2. The scavenging air pump supplies air to a scavenging header l3 which delivers the air to cylinders ll to aid in completely ridding the cylinders of burnt gases. Fuel oil is supplied to the cylinders ll by fuel pumps, generally designated l5, which pump the oil under high pressure through fuel' feed pipes l6 and into the engine cylinders I 4 through fuel injection valves Il The fuel-pumps are driven from a countershaft 20 (Fig. 2), encased in a housing It (Fig. 1)

The'engine shown in Fig. 1 may drive a generator 23 and an exciter 24 or other power load.

: tails of the pumping head i5, while Fig. 2 shows most clearly the details of the driving 30 of the pump 15.

Referring to Fig. 4 the oil pumping head I5 is composedof-an outer casing which mounts mechanism 'a cylinder 36. [The cylinder 36 is held in the casing 35 by'a hollow cap screw 31and leakage of fuel oil past the cap screw is prevented by a packing washer 38.

The interior of the cap screw3'l mounts an exhaust valve 39 which leads to'the fuel feed pipes I heretofore mentioned.

A piston I reciprocates in the cylinder it forcing oil received through ports ll out through the exhaust valve 39 to supply the fuel tothe engine'cyllnders l4.

. The side of the piston 40 is cut away to form a recess 42 which provides a means to regulate v the quantity of fuel oil delivered to the engine cylinders M. The recess I2 is in communication with the area above the top of the cylinder, so that when the recess comes opposite the ports ll pressure is relieved in the cylinder and no further pumping occurs. The time at which the recess 42 comes opposite the ports 4| is governed by a sleeve 43 which engages a cross-head 44 on the piston to turn the latter.

The positions of the recesses 42 on all the pumps 15 in the engine shown are regulated simultaneously and automatically through a governor 45 (Fig. 1) so as to give constant speed to the engine regardless of load. The governor 45 turns a shaft 46, which moves racks 41. The racks 41 engage gears 41' on the sleeves 43 to adjust the angular position of the pistons 40.

The piston 40 is operated from a cam 48 through a cross-head and plunger 49, shown in Fig, 2.

Referring to Figs. 4, and 6, the fuel oil is supplied under constant air pressure to the pumps l5 through'an oil feed pipe 50 which supplies all of the fuel pumps. The pipe 50 opens into successive air domes 5| situated immediately adja cent the oil pumps l5. Each air dome 5| has a port 52 to one side thereof opening into a nipple 53 fixed in the casing 35 adjacent the port 4|. The port 52 is controlled by a pet cock 55 so that flow of oil to each individualengine cylinder may be controlled.

In the event that the engine runs at a dangerous speed, the governor 45 opens a valve (not to shut off the flow of oil therethrough, arid a shown) which admits air through a pipe 51 into the fuel pump l5, causing the engine to stop and thus avoiding damage due to excessive speed.

Operation In operation oil is supplied under pressure through the pipe 50 to the successive air domes 5! adjacent the pumps l5. As the oil under pressure rises in the air domes 5| air is trapped in the space above the oil and is compressed by the oil pressure to the same static pressure as the oil.

When the fuel pump piston 40 is withdrawn, uncovering the ports 4|, the pressure of the air in the domes 5| causes the 'oilto be forced from the air dome through the passage 52 and the nipple 53 into the cylinder 36.

The air domes 5| eliminate the inertia of the usual long column of oil in the feed pipe by providing a short column extending from the top of the oil surface in the air domes 5| to the pump under the influence of the air pressure in the air domes 5i and provides for a very rapid filling tion into the engine cylinders I 4.

The individual air domes adjacent each cylinder adapt the engine for ships or othervehicles as no ordinary tipping or swaying is likely to allow air from the domes 5| to enter the fuel pump cylinders 36 to interrupt the operation of the engine.

It will be understood that the invention is not limited to the details of construction shown in the drawings and that the phraseology employed in the specification is for the purpose of description and not of limitation,

The invention is hereby claimed as follows:

" 1. In a fuel feed system for a solid injection engine, a fuel pump, an air dome connected with the inlet of said fuel pump, means to lead oil from the bottom of said air dome and deliver the same to said pump, a control valve in said means.

supply pipe opening into said air dome to supply oil thereto.

2. In a fuel feed system for solid injection engines having a plurality of cylinders, a fuel pump adjacent each of said cylinders, an air dome connected with the inlet of each of said fuel pumps, means to supply fuel oil to each of the fuel pumps from the lower portion of the adjacent air dome, and a fuel supply linepassing through each of said air domes successively.

=3. In a fuel feed system for solid injection engines having a plurality of cylinders, a fuel pump adjacent each of said cylinders, an air dome connected with the inlet of each of said fuel pumps, means to supply fuel oil to each of the fuel pumps from the lower portion of the adjacent dome, and a fuel supply pipe opening into each of said air domes successively above said means.

4. In a fuel feed system for a solid injection engine, a fuel pump, an air dome mounted at the inlet of said fuel pump, fuel conducting means adapted to deliver fuel from said air dome to the inlet of said fuel pump, and a pipe adapted to deliver fuel oil to said air dome at a point above said fuel conducting means.

5. In a fuel feed system for a solid injection engine, having a plurality of cylinders, a fuel pump adjacent each of said cylinders, an air dome connected with the inlet of each of said fuel pumps, means to supply fuel oil to each of the fuel pumps from the lower portion of the adjacent air dome, means to control the flow of fuel to each pump individually, and a fuel line passing through each of said air domes successively.

6. In a fuel feed system for a solid injection engine, having a plurality of cylinders, a fuel pump adjacent each of said cylinders, an air dome connected with the inlet of each of said fuel pumps, means to supply fuel oil to each of said fuel pumps from the lower portion of the adjacent dome, means to control the flow of fuel to each pump individually, and a fuel supply pipe opening into each of said air domes successively above said means.

7. In a fuel feed system for a solid injection engine, a single cylinder fuel pump, an air dome mounted at the inlet of said fuel pump, fuel conducting means adapted to deliver fuel from said air dome to the inlet of said fuel pump, and a pipe adapted to deliver'fuel oil to said air dome at a point above said fuel conducting means,

EMIL GRIESHABER. 

